Arc-lamp.



R. G. 'STANDERWICK.

ARC LAMP. APPLICATIONFILED JULY 1a. 1913.

Fig.5.

by 7/ i Hls ff torneg.

Patented Oct. 31', 1916.

UNITED STATES PATENT OFFICE. V

REGINALD G. STANDERWICK, OF LYNN, MASSACHUSETTS, ASSIGNOR TO GENERAL ELECTRIC COMPANY,- A CORPORATION OF NEW YORK.

ARC-LAMP.

To all whom it may concern:

Be it known that I, REGINALD G. STAN- DERWICK, a subject of the King of Great Britain, residingat Lynn, in the county of Essex, State of Massachusetts, have invented certain new and useful Improvements in Arc-Lamps, of which the following is a specification.

My invention has reference to an are lamp, and more particularly to a novel form of mechanism by which the arc is established and regulated and one of the electrodes fed toward'the other, all of these operations being effected by a single,.magnet 5 arranged in shunt to the arc.

The lamp embodying my invention is more particularly intended for operation on multiple circuits, and Ihave illustrated my invention embodied in a luminous arc lamp go in which the positive electrode is nonconsuming and the negative electrode composed of a material that yields a luminous are, such for example as themagnetite mixture disclosed in patent to Elmen, No. 1,057,046, which was granted March 25, 1913.

For a. fuller understanding of my invention, reference may be had to the accompanying drawing, in which Figure 1 is a side elevation of an arc lamp so embodying my invention, with-the globe and other accessories to the lamp, which form no part of my invention and which are not necessary for a proper understanding of the same, omitted; Fig. 2 is a-diagrammatic l view showing the circuit connections, and

Fig. 3 is a section on the line 3-3 of Fig. 1. I have illustrated my invention in a lamp which is supported from beneath instead of being suspended from above, although it will, of course, be understood that my invention is applicable to a lamp of the latter type.

In the drawings, 1 is the bottom support- .ingplate for the lamp, which may be mounted upon any suitable support. A top plate 2 is secured to the bottom plate 1 by spacing posts 3, and a third plate 4 is located betweenthe plates 1 and 2 and is also secured to the spacing posts. The opcrating magnet 5 is suitably secured to the under side of the plate 4. The upper and lower electrodes are represented by the reference numerals6 and 7, respectively. The upper electrode is provided with radiating wings 9, which are received in slots 10 in a Specification of Letters Patent.

a slot 19 in the bracket.

Patented Oct. 31 1916.

Application filed July 18, 1913. Serial No. 779,748.

the core or central portion 1520f the armature of the magnet 5 and extends through the bottom plate 1 of the lamp and moves with the lower electrode. The armature of the magnet has in addition to the core 15 a yoke with two arms 16 which extend upwardly outside of the magnet winding. A lifting clutch 17 is pivoted to a bracket 18 secured to the lower side of the armature, the arm of the clutch being received within The clutch engages the lower electrode rod 14. This clutch is of the shoe form, as indicated in dotted lines in Fig. 2, so that the clutch is free to move downwardly over the rod 14 but grips the same when the clutch is lifted. The lamp is also provided with a holding clutch 20 which also engages the rod 14. This clutch is connected to the armature 0f themagnet through a stem 21 which is provided with a lateral pin or arm 22, to which one end of a tension spring 23 is connected, the other end of the spring being connected to the outer end of the arm of the clutch 20. The stem 21 passes loosely through the yoke portion of the armature and is guided in its movements by. a sleeve 24 secured to the base plate 1. The upper end of the stem 21 is provided with a cross pin or bar 25,

the stem 21 and pin 25 being so arranged that when the armature of the magnet is in its lowest position, an appreciable space is left between the armature and the cross p'inso that there is considerable lost motion when the armature is lifted before it engages the pin 25, for a purpose which will be more fully hereinafter set forth. The upward movement of the clutch 20 is limited by a stop 26 secured to the sleeve 24 and its downward movement is limited by a stop 27 surrounding the lower electrode rod 14 immediately above the bottom plate '1 of the lamp. The bottom plate is provided with' a boss 28, which forms a stop for the bracket 18 and which thus supports the armature 15 when the same is in its lowest position.

The movement of the armature of the magnet is damped by a dash-pot 29, the piston 30 of which is secured to the plate The top of the cylinder of the dash-pot is connected by a link 31 to one end of a lever 32 pivoted on a bracket 33 secured to one of the spacing posts 3 of the lamp, while the other end of the lever 32 is connected by a link 34 to one of the arms 16 of the armature of the magnet. A second lever 32 1s similarly connected by links to the upper end of the cylinder of the dash-pot and to the other arm 16 of the armature, respectively. (See Fig. A guide member 35 for the lower electrode in the form of a frustum of a cone is secured to the top plate 2, and at the same time conducts air to the arm from a region removed from the arc, .in order that the are may not be rendered unsteady by disturbances 1n the atmosphereoutside the globe.

The leading-in wires for the lamp are indicated in Fig. 2 by the reference numerals 36 and 37. The conductor 36 is connected through a steading resistance 38 to the lower electrode rod 14, which is in turn connected by a conductor 39 to oneterminal of the magnet 5, the other terminal of which is connected by a conductor 40 to the upper electrode 6 to which the leading-in wire 37 is connected. A reactance 41'may be included in the arc circuit, if desired, for the purpose of steadying the arc.

The operation of my lamp is as follows:

I When the lamp is without current, the

lower electrode is separated from the up per electrode by gravity.- Now when current is turned on the lamp,'the magnet '5,

which is connected in shunt to the arc, is,

operatively energized and lifts its armature, and by means of the lifting clutch, the electrode rod 14 is lifted and the electrode 7 brought into engagement with the upper support the weight of the armature and its load. Now, as the lower electrode burns away, the arc lengthens and the voltage .across the same increases, with the consequence that the shunt magnet is more strongly energized and lifts its armature and the lifting clutch 17. During the first part of the upward movement of the lower electrode, the lifting clutch 17 only is inyolved, as the armature of the magnet has not yet engaged the cross pin 25 and the clutch 20 is idle. When the lower electrode is consumed to such an extent that the armature in its endeavor to maintain a constant arc, engages the cross pin 25 then the two clutches rise together until the holding clutch 20 engages thestop 26. The lifting clutch 17, however, is free to continue its upward movement carrying the electrode rod 14 with it, which rod is free to pass upwardly through the holding clutch 20. Now, when the electrodes have been brought sufficiently 'close together to reduce the arc voltage any slight downward motion of the armature such as occurs in regulation will cause the lower clutch to engage the lower stop 27 and thus arrest the downward move-. ment of the electrode rod 14, while the clutch 17 is free to slip back over the electrode rod 14. It willthus be clear that the arc is established and regulated and the lower electrode fed toward the upper elec trode without any interruption of the arc and by means of a single magnet and cooperating armature which actuate's two clutches, and that the lower electrode is fed forward while the armature of the magnet is in its floating condition.

In accordance with the provisions of the patent statutes, I have described the principle of operation of my invention together with the apparatus which I now consider to represent the best embodiment thereof; but I desire to have it understood that the apparatus shown is only illustrative and that 1. In an arc lamp, a member movable with the lower electrode, an actuating member, a pair ofclutches operated'thereby each engaging said movable member, the one-connected directly to said actuating member, and the other connected to said member through a lost motion and a yielding connectlon, the yielding connection becoming effective only after the lost motion has beentaken up.

2. In an arc lamp, a movable member, an actuating member, a pair of clutches operated by said actuating member engaging said movable member, the one directly and the otherthrough a lost motion connection and a spring which becomes effective only after the lost motion has been taken up and a stop on'either side of the latter clutc 3. In an arc lamp, an upper and a lower electrode,a magnet arranged in shunt to the arc, an armature coeperating therewith, a lifting clutch operated by said armature for feeding the lower electrode toward the upper and'for' regulating the arc, a holding I clutch for the lower electrode having a lost v motion and a yielding connection with said armature, and stops for said holding clutch,

one above and the other below-said holding clutch.

4. In an arc lamp, an upper electrode, a lower electrode normally separated from said Correctionsjn-LeitersPatent N04, 2o3,427.

upper electrode when the lamp is without current, a shunt magnet having an armature codperating therewith, a lifting clutch operated by said armature for liftlng the lower electrode into engagement with the upper for establishing the arc and for subsequently regulating the same, and a holding clutch having a lost motion and a yielding connection with said armature, and stops for said holding clutch, one located above said clutch and the other below the same.

5. In an arc lamp, an upper non-consuming electrode, a lower consuming electrode normally separated from the upper electrode when the lamp is without current, a member movable with said lower electrode, a magnet arranged in shunt to the arc and a co operating clutch engaging said movable member, said clutch being free to move downwardly over said member and to grip said member in its upward movement, a second clutch engaging said member and having a lost motion and a yielding connection with said armature, said clutch being free to move downwardlyover said member and adapted to grip the same in its upward movement, and a limiting stop on either side of said holding clutch} 6. In an arc lamp, upper and lower electrodes, the lower electrode being separated from the'upper when the lamp is without Copies of this patent may be obtained for armature, a lifting and a holding clutch connected to said armature, the lifting clutch directly and the holding clutch by means of a yielding and a lost motion connection, the lost motion connection being open when the lamp is without current and during normal operation, and closed when the lower electrode is brought into engagement with the upper and when a feeding operation is desired.

7. In an arc lamp, an upper electrode, a lower electrode separated from the upper when the lamp is without current, means for establishing, striking, and regulating the arc, comprising a magnet in shunt to the arc and a clutch operated by the armature of said magnet, and additional means cooperating with the first-named means for feeding said lower electrode forward, comprising a second clutch having a lost motion and a yielding connection with said armature, the yielding connection becoming effective only after the lost motion is taken up.

In witness whereof, I havehereunto set my hand this 16th day of July 1913.

REGINALD Gr. STANDERWICK.

five cents each, by addressing the Commissioner of Patents, Washington, D. 0. i

A It is hereby certi-fied that in Letters Patent No. I,2{l3,4 27,l granted October ,31, 1 916, the application of Reginald Stanilerwick, of Lynn, Massachusett for an improvement in- Arc-Lamps, appear in the printed specification requiring correction as follows Page 2, line 16,. for the word arm "i ieaa' e rc; seine 'pag e', line 23,: for, the, word steadingi read steadying} and that'the said I Letters Patentshould be read with these corrections therein the same may to the record ofithe' case in thePatent Ofiic'e I v I I f; Signed andsealedthis28th day otN-evember, A; 1);, I916.

v CLAY, Acting Commissioner ofPatmt's. 

